Oil-burner shut-off



July 13, 1926. 1,592,261

Y R. L. DORAN on. BURNER SHUT-OFF Filed Nov. 19; 1925 2 Sheets-Sheet 1 Patented July 13, 1926.

ROBERT L. DURAN, OF CHICAGO, ILLINOIS.

isaaze OIL-BURNER SHUT-OFF.

Application filed November This invention relates to improvements in oil furnaces and the like and more particularly to safety automaticshut-offs for the same.

Heretofore the shut-ofi devices have included springs which are objectionable from the standpoint of fire hazard, and the construction has been complicated and the shutoff valve has often beenclosely associated with other functioning movements in the burner. The main objects of this invention are to provide a safety shut-01f device operable by an accumulation of unburned fuel; in which all springs are eliminated, which is more simple in its parts and in construction, and

' which may be reset ina simple manner.

An illustrative embodiment of this invention is shown in the accompanying drawings, in which:

Figure 1 is a side elevation of the oil burner. V

Fig. 2 is a detail section of the shut-off valve.

Fig. 3 shows a modification.

In this invention a gravity closing shutoff valve is used in the oil supply line. The valve is normally held'open by means of a plunger which contacts with a lower projection on the valve and which rests on a lever a short distance from the lever fulcrumi The outer end of the lever has a latch projection which is engaged by a pin in a depending arm of the pivoted balance beam.

In the drawings the base 1 of the burner is supported on a post 2Q The oil control valve is located in the housing 3 carried on the base and governs the flow of oil from the oil supply line 1 into the furnace through the oil line 5. Amotor 6 for supplying air to the furnace is suspended from the base 1 and operates a blower in the air duct 7.

In case the burner fails to operate the unburned oil is drained back through the drain pipe 8 and is collected in the bucket or receptacle 9 hung on the pivoted balance beam 10 and is utilized, as will be described, to stop the oil feedto the furnace.

The beam 10 is pivoted to the base 1 and has a horizontal weight arm 11, on which the bucket 9 is hung; an oppositely extending counter-weight arm 12, provided with i a shiftable weight 13; and a thirddepend- 19, 1925. Serial in 70,060.

operative relation with and above thevalve port 20. which communicates from the upper valve chamber 19 to the lower valve body chamber 21. In order to avoid openings in the lower chamber which might leak oil, the valve lifting plunger 22, slidably mounted in a bracket 23 secured to the lower end of the valve body 17, is terminated be low a flexible diaphragm 24; secured over the lower open end of the chamber 21.

The valve 16 has a lower stem 25 passing loosely through the valv passage 20 and contacting with the diaphragm stud 26 secured in the center of the diaphragm by a lock nut 26.1. A lever 27 is pivoted in the depending arm 28 of the bracket 23 and the swinging end of the lever has a lip or projection 29, which is engaged by the pin 15 in the depending arm 14 of the trip beam 10.

For normally holding the valve 16 open. the swinging end of the lever 27 is raised and held by the catch pin 15, thereby raising the plunger 22 to contact through the diaphragm 24-, and lift the valve 16 from the valve seat in the port 20, as shown in Fig ure 1 and Fig. 2.

To limit the swinging movement of the beam 19, a bail or guard 30 is formed in the end of the valve lever 21 which surrounds the lip 29, and confines the movement of the pin '15 within the opening thereof.

In setting, the counter-weight 13, is set in a suitable radial distance from the pivot of the beam 10 to slightly overbalanc'e the empty bucket 9 and tend to rotate the beam clockwise. The outer end of the valve lever is raised and the pin 15 engaged under the lip 29. hen a sufiicient amount of oil has collected in the bucket 23 to overcome the unbalanced weight to the right of the pivot andL the friction of engagement of the contacting parts, the lever 10 is rotated counterclockwise. This movement swings the pin 15 out of engagement and allows the end of the lever 27 to drop by gravity until the pin 15 strikes the upper part of the guard 30. The valve plunger 22 follows the lever downward to the limit of the movement and allows the valve 16 to close by gravity. When the lever 27 is in released position, as described above, the end of the diaphragm stud 26 drops away from the end of the valve stud 25 so that the valve 16 is free to close the port 20, and stop the passage of oil from the supply line 4:, into the lower chamber which communicates through the passage 31, in the valve body 17, to the pipe 18.

In Fig. 3. is shown a simplified arrangement omitting the lever 27. In other respects the same parts are used except that the lever 10, is pivoted on a lug 17.1. of the valve body 17, and the bail. or guard. 30 is fixed on the projecting end of the plunger 22, and the lower end of the plunger 22, is recessed slightly to hold the pin 15. and the beam 10 is more closely balanced. The functioning is similar to the functioning of the arrangement shown in Figure 1 and Fig. 2'. When sutlicient unburned fuel is drained back and collects in the beam bucket 9, the beam is rotated counter-clockwise. The pin 15, is moved from under the plunger 22 and the plunger drops and allows the valve 16 to close.

lVhile but one illustrative embodiment of the invention has been shown, alterations. omissions and rearrangen'ients may be made without departing from the spirit of this invention.

I claim:

1. In combination in an apparatus of the class described. a self-closing shut-ofi' valve. means for holding the valve open, a pivoted bell-crank lever having a pin adapted to releasablv engage and hold said means with the valve in raised position, and a receptacle attached to the beam for receiving fluid for rotating said beam to disengage said pin and said valve holding means.

2. In combination in an apparatus of the class described. a valve slidablv guided in superposed relation with the valve orifice and having a stem extending downwardly through said orifice, a plunger subadjacent to said stein. a pivoted bell-crank lever having av pin which is downwardly ofi'set from the pivot of said beam, and a pivoted hori- Zontal lever for raising said plunger having a notch for engaging with said pin.

3. In combination in an apparatus of the class described, a gravity closed valve, a lever adapted to contact and raise the valve. a pivoted bell-crank lever having a pin adapted to be engaged with said lever for holding the lever with the valve raised, and a receptacle hanging onthe beam for receiving fluid for roating said beam to disengage said pin.

4:. In combination in an apparatus of the class described, a graviti closed valve. a lever adapted to contact and raise the valve. :1 pivoted bell-crank lever having an offset pin adapted to be engaged with said lever for holding the lever with the valve raised, a guard on the lever loosely enclosing the pin. and means for rotating said beam to disengage said pin.

5. In combination in an apparatus of the class described, a gravity closed valve. l fting means for raising the valve having a projecting lip, a pivoted bell-crank lever having a pin adapted to engage with said lip when the beam is suitabl; rotated to hold said means in lifted position. and fluid receiving means on the beam for rotatinf: said beain to release said means.

6. In combination in an apparatus of the class described, a gravity closed valve. a stem slidably mounted below and in contacting relation with the valve, a pivoted lever adapted to contact with the lower end of said plunger to lift the plunger into contact with and to raise the valve. :1 pivoted bellcrank lever having a pin adapted to engage and hold the lever. means for overl'mlancimr said beam to maintain said engagement with the lever, and a receptacle on the beam for receiving waste fluid to rotate the beam and move said pin out of engagement with said lever.

7. In combination in an apparatus of the class described, a pivoted lever for holding parts of the apparatus in normal position, a swinging catch arm having a pin in cngaging relation 'ith the end of said lever. and a guard secured to the end of said lever and surrounding said pin to limit the unengaged movement of said swinging arm.

Signed at Chicago this 17th day of IIov. 1925.

ROBERT L. DORAX. 

